pfSense/pfsense 428f6f0src/usr/local/www diag_backup.php

Fix output buffering when downloading config backups. Fixes #9390

(cherry picked from commit 4015b03d4b184e546cb3590430fee6f9953ce23e)
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+5-1src/usr/local/www/diag_backup.php
+5-11 files

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